/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraScript.h
Deletes the version data for an existing version. The exposed version cannot be deleted and will result in an error. Does nothing if the guid does not exist in the script's version data.
virtual void DeleteVersion ( const [FGuid](API\Runtime\Core\Misc\FGuid) & VersionGuid )